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Strange flat spots. 

 

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 Post subject: Strange flat spots.
Posted: Wed Jun 20, 2007 9:40 pm 
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Location: Castlemaine
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Hi.

I have had this problem for atleast six months.

Through the rev range of my car it has flat spots.

In other words the power is not "linear", as in every 1,500rpm there is a dead spot for about 400rpm, it begins just after 2,000rpm.

I have replaced the leads, cleaned the ISC and Ford have checked the plugs and coil pack.

The car doesnt have the issue out of gear.


Car is a 96 EF2 I6 Sedan, 230,000ks with reco head about 30,000 ago.


Any help would be great.
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Posted: Wed Jun 20, 2007 10:12 pm 
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i had this issue with my fairlane when it dropped back to idle it almost stalled. mine ended up being a loose vaccume line from the aircon (think black one) but yours seems to be right through the range... id check your hoses just to be sure

 

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Posted: Wed Jun 20, 2007 11:14 pm 
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I have had something similar with my ef, and it went after I replaced the o2 sensor. mite be something to do, you can get them cheap off of e-bay anyways good luck.
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Posted: Wed Jun 20, 2007 11:16 pm 
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ah yeah true.. im swapping mine tomorrow lol. mine runs rich as

 

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Posted: Thu Jun 21, 2007 9:23 pm 
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could be vac leak??

 

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Posted: Thu Jun 21, 2007 11:55 pm 
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ea_falcon wrote:
could be vac leak??


Whats the best way to determine if it is?
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Posted: Fri Jun 22, 2007 12:01 am 
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listen for a hissing noise... if you hear it its one of 2 things... vaccume leak or a snake

 

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Posted: Fri Jun 22, 2007 12:39 am 
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huggiebear wrote:
listen for a hissing noise... if you hear it its one of 2 things... vaccume leak or a snake


hahahahahaha touche

 

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Posted: Fri Jun 22, 2007 1:33 pm 
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Im getting tthe exact same issue atm.
Mine only started after i changed to new pacies. Im thinking it might be something to do with the o2 sensor somehow? Doubtful, but worth a look i suppose.
Have also posted this in pertheseries.com and they've told me it could be the coil pack.

Any answers, please let us know. Its pissing me right off. Go to take off normally, and not even applying any more pressure on the throttle, the car gets a flat spot, then 2 secs later, damn car goes like a little rocket on roids :\
So annoying. Not to mention the very lumpy (almost 'missing') type of idle.

Oh also, this only happens to me once the car has warmed up completely.

 

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Posted: Fri Jun 22, 2007 2:44 pm 
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remove the O2 sensor but sit it in the hole (just catch thread so it stays but easily removed by hand) start the car, when it warms up or gets the flat spots pull the sensor out and see if the motor changes.

my mate done this to his fairlane the other day and the O2 sensor was soo stuffed the idle didnt change at all...

 

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Posted: Fri Jun 22, 2007 5:16 pm 
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Ill give that a shot! But it really only happens when its in gear. (cars automatic)

 

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Posted: Fri Jun 22, 2007 5:24 pm 
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i just changed mine with the one from my EA wreck. 2 totally different looking units. EA one is factory NC im not sure. but i changed that and it solved my massive fuel usage. i also have a dead spot type thing where i give it some revs then back off and it almost dies before the computer kicks the revs back up. i swapped map sensors and it ran ok. i then swapped the sensor on top of the throttle body and the idle roamed all over the place. so i used degreaser and cleaned the s**t out of the NC one and put it back on. it seems on now but im going to leave it till tomorrow to see if its still there. if it continues ill put the EA computer into it and see how it runs

 

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http://www.fordmods.com/the-garage-f53/my-new-nc-ii-fairlane-dial-up-warning-t50380.html

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Posted: Fri Jun 22, 2007 6:11 pm 
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put water on the vac hoses see if it bubles and makes hissing sound it would even be a vacume hose not pushed in properly
its worth a quik check

 

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